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Finding the Fourth Proportional to 1,878.31, 2,817.20 and 782.47

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Solution

The fourth proportional to 1,878.31, 2,817.20 and 782.47 is: 1,173.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,878.31 : 2,817.20 = 782.47 : x
  2. Step 2: Convert to fraction form
    1,878.31/2,817.20 = 782.47/x
  3. Step 3: Cross multiply
    1,878.31x = 2,817.20 × 782.47
  4. Step 4: Simplify right side
    1,878.31x = 2,204,370.57
  5. Step 5: Solve for x
    x = 2,204,370.57/1,878.31
  6. Step 6: Final answer
    x = 1,173.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.